Improvement in burglar-alarms



ZSheets-Sheetl. W. BOYD.

BURGLAR-ALARM. No.175,590. Patented April 4, 1876.

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dd%W/ MPEYERS. PHOTO-LITHDGRAPHER, WASHINGTON D C ZSheets-SheetZ.

W. BOYD.

BURGLAR-ALARM. No.175,590. Patented April 4, me.

N-PETERS. PNOTO-LITNOGRAPNER. WASHINGTON. D C.

UNITE STATES PATENT WILLIAM BOYD, OF MANSFIELD, MASSACHUSETTS. v

IMPROVEMENT IN BURGLAR-ALARMS.

Specification forming part of Letters Patent No. 175,590, dated April4,1876; application filed February 15, 1876. 7

To all whom it may concern Be it'known that I, WILLIAM Born, ofMansfield, in the county of Bristol and State of Massachusetts, haveinvented a new anduseful Improvement in Burglar-Alarms, of which thefollowing is a specification My invention is designed to give an alarmin case the doors or windows of a house are opened at night, which alarmmay be graduated according to circumstances, may be continuous, and alsoaccompanied by the striking of a light. The alarm may be communicated toone or more apartments in the same house, or may be communicated toother neighboring houses to summon assistance in case of a burglariousattack.

In the annexed drawings making part of this specification, Figure 1 is aplan view of the alarm, showing also one convenient attachment to a dooror window for giving the alarm when the same is opened. Fig. 2 is anelevation of the alarm-mechanism. Fig. 3 is an elevation partly insection, showing the firing mechanism; and Fig. 4 is an elevation of themechanism for striking a light.

The same letters are employed in all the figures in the indication ofidentical parts.

A is the frame, to which the alarm-mechanism is attached, and B the wireby which it is put in action. The wire B is connected with a series ofwires, B running through all the exposed parts of the building andconnected with the windows or doors, so that when any of them are openedthe wire B shall be drawn out. l have shown in Fig. la convenientattach'lnent'for the doors or windows. 0 is a bent lever pivoted atoneend, and having the other attached to a wire, which, by means of theordinary bell-wire system, is extended to the alarm. D is the shackle ofa bolt or look attached to the door or window, while the lever isfastened to the frame. When the house is closed for the night, the boltD being shot when the door, window, or windowshutter is open ed, theshackle, pressing against the bent lever G, will draw on the wire andactuate the alarm. E is a frame, to which is attached a pistol-barrel,with a nipple for a percussion-cap, so that the alarm may be given bythe action of the hammer 15 on the nipple or by the explosion of thecap, or by firing the pistol loaded with powder. F is the triggerpivoted on the outside and acting upon the arm E,'\vhich projects fromthe lock through the casing. The lock is the ordinary percussionlock.The lower end of the triggeris inserted in a slot in a cylindricalattachment, B attached to the wire B, clearly shown in Fig. A spiralspring, G, serves to retract the wire B when released after being drawnout. It is attached to one arm of a bell-crank, H, an arm of which, H,serves as a stop for an alarmbell mechanism, consisting of the ordinaryclock-work I, escapement l, and hammer l acting on the bell K. When thespring of the clock-work is wound up it is held by drawing the arm Hagainst the arm I of the escapement. This is done by means of the wireL. When the wire B acts on the arm of the bellcrank H, the arm Hdisengages l and the alarm will sound continuously until it runs down.

The object of the bell is to give a sufficiently protracted alarm toawaken every one roused by the explosion so completely that they will bebrought to the full comprehension of the situation.

As an additional security I make provision for lighting a lamp'instantlyon the giving of the alarm. It is done in the following manner: L is alamp of camphine or some similar inflammable fluid, which will take fireinstantly from the flame ot' a match. Alongside ot' the lamp, which isheld firmly, I place a post, M, with a hole through it to receive amatch, which may be fixed in proper position by means of a set-screw.The t'ulminate end of .the match is placed on the wick of the lamp ornear to it, and in contact with the roughened face N of the oscillatingarm N, which is pivoted to the frame, so as to swing freely (aspiral-spring being attached to the arm N when the arm N is freed. Thisarm is engaged by turning it (against the tension of the spring) untilits point catches a hook, O, on the spring 0, the tension of the springbeing such as to hold the hook toward the arm N There is a swell, 0 withan inclined face on the spring 0, and a stud-pin projects from the lowerend of the trigger F at F, passing through a slot in the spring 0, andhaving a pin passed through a hole in the end of the stud to engage theinclined face of the swell and press back the spring when the trigger isdrawn back by the wire B, so as to disengage the hook 0 from the arm Nwhen the spring P will draw the surface N across the match M, and'lightthe lamp. To enable the match to sustain the strain of the surface N 1fix another post, Q, on the table, with a setscrew for fastening thehooked wire Q When it has been drawn up to hold the match.

I do not claim the parts of the alarm separately, nor broadly incombination. My invention is distinguished from the machine in which thesame general combination has been employed, not only in the organizationof the details of the mechanism, but in so connecting the operativeparts with the wire B that all the parts may be used united, or that anyof them may be used separately, which cannot be done when the operationof the other parts is made to depend on the motion of the hammer of thegun. I

It is evident that the stud-pin F instead of being attached to thetrigger, may be attached directly to the wires B B.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is-

1. In co ibination with the wire B, the trigger F, the bell-crank H, andoscillating arm N, respectively, attached to the gun-lock, thealarm-bell, and lamp-lighting mechanism, so that either or all the partsmay be actuated by drawing the wire, substantially as set forth.

2. In combination with the wire B and spring 0, and arm N the hook Oinclined surface 0 and stud-pin F for releasing the lamplightingmechanism, substantially as set forth.

3. In combination with the match and oscillating arm for igniting it,the adjustable hook Q, for supporting the stem of the match near thefulminate, substantially asset forth. I

4. In combination with a burglar-alarm and connecting-wires, B=B thebent lever O'and shackle D of a lock or bolt for actuating the alarmupon the opening of a door or Window, substantially as set forth.

5. In combination with the wire B, the slotted cylinder B trigger F,spring G, and bellcrank H, for operating both the firing-mechanism ofthe gun and the bell-alarm, by the direct action of the wire,substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM BOYD.

Witnesses:

SAMUEL WARNER, EVERETT F. BOYD.

